Effect of Leads and Quantum Fluctuations in Small Superconducting Tunnel Junctions

Abstract

For more than 20 years, experimenters have used the resistively- and- capacitively-shunted-junction (RCSJ) model to predict the dynamics of Josephson junctions. As the sample area decreases, two effects ignored in the model become relevant: First, the low impedance of the leads at high frequency (roughly 100 ohms compared to the dc impedance of 1 giga ohm, and second, quantum fluctuations of phi, the order parameter phase difference between the junction electrodes. We have observed dramatic evidence of the importance of both these effects. Keywords: Josephson junctions; Tunnel junctions; Superconductors.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1990
Accession Number
ADA227311

Entities

People

  • Alan T. Johnson Jr.

Organizations

  • Harvard University

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Band Gaps
  • Band Structures
  • Band Theory Of Solids
  • Computer Simulations
  • Dynamics
  • Electromagnetic Fields
  • Electron Beam Lithography
  • Energy Bands
  • Heat Energy
  • Impedance
  • Materials
  • Measurement
  • Phase Transformations
  • Quantum Mechanics
  • Simulators
  • Solid State Physics
  • Transmission Lines

Fields of Study

  • Physics

Readers

  • Computational Modeling and Simulation
  • Superconducting Magnet Technology

Technology Areas

  • Quantum Computing